Meaning

adjective coming next after the first in position in space or time or degree or magnitude

noun 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites

adverb in the second place

originFrom Middle English secunde, second, secound, secund, borrowed from Old French second, seond, from Latin secundus (“following, next in order”), from root of sequor (“to follow”), from Proto-Indo-European *sekʷ- (“to follow”). Doublet of secund and secundo. Displaced native twoth and partially displaced native other (from Old English ōþer (“other; next; second”)).

Etymology from Wiktionary, CC BY-SA 3.0